CN101180838B

CN101180838B - Communication apparatus and switching apparatus

Info

Publication number: CN101180838B
Application number: CN2006800159967A
Authority: CN
Inventors: 中村真人
Original assignee: Mitsubishi Electric Corp
Current assignee: Mitsubishi Electric Corp
Priority date: 2005-05-09
Filing date: 2006-05-08
Publication date: 2013-05-08
Anticipated expiration: 2026-05-08
Also published as: US7738461B2; CN101180838A; KR20080006584A; WO2006121014A1; US20090103441A1; DE112006001165T5; KR100940423B1; TWI323106B; JPWO2006121014A1; JP4308297B2

Abstract

According to a communication device of the invention, a CRC calculating part (21) calculates a DCS code from a DA field of a received frame to a DATA field thereof and also calculates an FCS code from the DA field of the received frame to a DCS field thereof. A DCS check part (22) outputs a DCS check result, which is obtained by checking the calculated DCS code against the DCS code of the DCS field, to a terminal function part (11). An FCS check part (23) outputs an FCS check result, which is obtained by checking the calculated FCS code against the FCS code of an FCS field, to an FCS converting part (27). The FCS check part (23) decides, based on the FCS check result, whether to transfer the frame directly or store the FCS code calculated in the FCS field into the frame and then transmit the frame. The terminal function part (11) decides, based on the DCS code, whether to perform an ordinary process or perform an extraordinary process.

Description

Communicator and switching apparatus

Technical field

The present invention relates to be applicable to use the communicator of the network system of layer 2 frame, especially, relate to the communicator and the switching apparatus that are applicable to lead directly to (cut through) mode network system.

Background technology

Current, consider to use in the error checking of the frame in communication the various technology of cyclic code (CRC:Cyclic Redundancy Check).For example, with 1 major node device and many subordinate node devices, looping network IEEE Standard 802.5Token Ring.Subordinate node device is in the normal situation of received frame, frame after the scramble (scramble) that transmission has been carried out standard to data and BCC is processed, in the situation that the frame that receives abnormal (verification to wrong), send data and BCC have been carried out processing frame after different scrambles is processed from the standard scramble.That is to say, make verification go out once wrong frame, as in the situation that subordinate node device implementation criteria scramble process and to certainly exist wrong frame and circulate, make in follow-up subordinate node device and produce mistake, the major node device is identified produce wrong (for example, with reference to patent documentation 1).

Patent documentation 1: Unexamined Patent 8-37541 communique

Summary of the invention

But in recent years, in industrial network system, real-time and maintainability are also paid attention to, and carry out just energetically the introducing of Ethernet (registered trade mark) technology.

In the network (hereinafter referred to as layer 2 network) that uses Ethernet (registered trade mark), the abnormality detection of Ethernet (registered trade mark) frame (hereinafter referred to as layer 2 frame) (detection of data variation) also adopts CRC according to the mode by the IEEE802.3 definition.

Specifically, by destination address field (DAF), source address field, type field, data field, and Frame Check Sequence (FCS:Frame Check Sequence) field consist of layer 2 frame, be configured in the node device (communicator) in network, when generating layer 2 frame, to destination address (destination address), transmission source address (source address), type, and data carry out CRC and calculate, result of calculation is kept in the FCS field and sends.Receive the communicator of layer 2 frame, to the destination address of the layer 2 frame that receives, source address, type, and data carry out CRC and calculate, with result of calculation and be stored in the CRC in the FCS field of the layer 2 frame that receives, the CRC result of calculation when namely sending compares, and detects data variation.

On the other hand, the exchanged form of layer 2 frame has through-type and the storage forwarding type.The storage forwarding type is after receiving layer 2 frame, the transmission target of the layer 2 frame that judgement receives, and send layer 2 frame.Relative with it, through-type is that the destination address field (DAF) of utilizing the storage of layer 2 frame to send destination address is positioned at this situation after the SFD of layer 2 frame, in the moment that receives destination address field (DAF), judgement transmits target, begins the transmission of layer 2 frame according to judged result.

Therefore, the moment of the destination address field (DAF) that receives layer 2 frame begin to transmit through-type, with until the storage forwarding type exchanged form that the final field of layer 2 frame (FCS field) just begins to transmit after all receiving is compared, it is from the reception of beginning layer 2 frame until to begin to send the propagation delay time of received layer 2 frame short.Therefore, in requiring to guarantee the industrial network system of real-time, adopt the communicator of through-type exchanged form more.

But, in the prior art of putting down in writing in above-mentioned patent documentation 1, because be after judgement has inerrancy, determine the scramble that (FCS that is equivalent to layer 2 frame) this part from data to BCC is implemented is processed, so there is the problem that to use the through-type exchanged form that begins to transmit a DAF destination address field that receives layer 2 frame.

In addition, even adopt the exchanged form of storage forwarding type, in the prior art of above-mentioned patent documentation 1 record, make and once wrong layer 2 frame detected, also will inevitably produce mistake in follow-up communicator, simultaneously, the Master Communications device is identified reliably produced wrong this situation, but also have the problem that to determine to produce wrong transmission path.

That is to say, in the prior art of above-mentioned patent documentation 1 record, because if produce once mistake, producing wrong frame can transmit along network always, until abandoned, even so exist communicator to preserve error message, also can't judge it is the mistake that is produced by transmission path, or because receive the problem of the mistake that produces wrong layer 2 frame and produce.In addition, even utilize when layer 2 frame wrong being detected, the communicator that has almost transmitted the through-type exchanged form of layer 2 frame integral body consists of network, in this case, because produce wrong layer 2 frame always along Internet Transmission, until go out of use, thus with the prior art of above-mentioned patent documentation 1 record similarly, also can't determine to produce wrong transmission path.

Especially, in the token passing mode, make communicator connected to the network transmit layer 2 frame, and the exception bits of transmission path is equipped with in a plurality of situations, can't carries out the judgement of the out-of-the way position of transmission path.

The present invention proposes in view of the above problems, and its purpose is to obtain a kind of communicator, and it is in the situation that the through-type exchanged form of use also can determine to produce wrong transmission path.

in order to solve above-mentioned problem, to realize above-mentioned purpose, communicator of the present invention has: termination function section, and it carries out the reception ﹠ disposal of frame, and exchange handling part, it exports the frame that receives to the aforementioned terminals function part, transmits the aforementioned frame that receives according to direct-passing mode simultaneously, it is characterized in that, aforementioned frame is made of following field: destination address field (DAF) is da field, and its storage sends the address of target, source address field is sa field, the address of its storage transmission source, type field, it stores frame length, user data fields, and the Frame Check Sequence field is the FCS field, its storage FCS code, this FCS code is the check code for the error checking of the data that are stored in aforementioned da field, aforementioned sa field, aforementioned type field and aforementioned user data fields, aforementioned user data fields is made of following field: data field, the user data that its storage should send, and the data check sequence field is the DCS field, its storage DCS code, this DCS code is be used to being stored in aforementioned da field, aforementioned sa field, the aforementioned type field, and the check code of the error checking of the data in the aforementioned data field, aforementioned exchange handling part is according to being stored in aforementioned da field, aforementioned sa field, the aforementioned type field, and the data in the aforementioned data field, calculate the DCS code, according to being stored in aforementioned da field, aforementioned sa field, the aforementioned type field, data in aforementioned data field and aforementioned DCS field, calculate the FCS code, aforementioned exchange handling part has: the DCS check portion, its DCS code to calculating, compare with the DCS code in the aforementioned DCS field that is stored in the aforementioned frame that receives, and export the DCS check results that obtains to the aforementioned terminals function part, the FCS check portion, it compares the FCS code in the FCS code that calculates and the FCS field that is stored in the aforementioned frame that receives, and the FCS check results that obtains of output, the FCS transformation component, it directly transmits the aforementioned frame that receives in the situation that aforementioned FCS check results is consistent, is in inconsistent situation in aforementioned FCS check results, the aforementioned FCS code that calculates is kept in the FCS field of the aforementioned frame that receives, and transmits, and erroneous frame count pick up device, it is in inconsistent situation in aforementioned FCS check results, count value is progressively increased, the aforementioned terminals function part, in the situation that aforementioned DCS check results is consistent, according to carrying out normal process by the frame of aforementioned exchange handling part input, be in inconsistent situation in aforementioned DCS check results, execute exception is processed.

communicator of the present invention, it has: termination function section, it carries out the reception ﹠ disposal of frame, and exchange handling part, it exports the frame that receives to the aforementioned terminals function part, transmits the aforementioned frame that receives according to direct-passing mode simultaneously, it is characterized in that, aforementioned frame is made of following field: destination address field (DAF) is da field, and its storage sends the address of target, source address field is sa field, the address of its storage transmission source, type field, it stores frame length, data field, the user data that its storage should send, the data check sequence field is the DCS field, its storage DCS code, and this DCS code is the check code for the error checking of the data that are stored in aforementioned da field, aforementioned sa field, aforementioned type field and aforementioned data field, and the Frame Check Sequence field is the FCS field, its storage FCS code, this FCS code is be used to being stored in aforementioned da field, aforementioned sa field, the aforementioned type field, the aforementioned data field, and the check code of the error checking of the data in aforementioned DCS field, aforementioned exchange handling part is according to being stored in aforementioned da field, aforementioned sa field, the aforementioned type field, and the data in the aforementioned data field, calculate the DCS code, according to being stored in aforementioned da field, aforementioned sa field, the aforementioned type field, data in aforementioned data field and aforementioned DCS field, calculate the FCS code, aforementioned exchange handling part has: the CRC calculating part, its beginning from the aforementioned frame that receives begins to carry out CRC and calculates, calculate DCS code and FCS code, the DCS check portion, it compares the DCS code in the DCS code that calculated by aforementioned CRC calculating part and the aforementioned DCS field that is stored in the aforementioned frame that receives, and exports the DCS check results that obtains to the aforementioned terminals function part, the FCS check portion, it compares the FCS code in the FCS code that calculated by aforementioned CRC calculating part and the FCS field that is stored in the aforementioned frame that receives, and the FCS check results that obtains of output, the FCS transformation component, it directly transmits the aforementioned frame that receives in the situation that aforementioned FCS check results is consistent, is in inconsistent situation in aforementioned FCS check results, the aforementioned FCS code that calculates is kept in the FCS field of the aforementioned frame that receives, and transmits, and erroneous frame count pick up device, it is in inconsistent situation in aforementioned FCS check results, count value is progressively increased, and the aforementioned terminals function part is in the situation that aforementioned DCS check results is consistent, according to carrying out normal process by the frame of aforementioned exchange handling part input, be in inconsistent situation in aforementioned DCS check results, execute exception is processed, and aforementioned exchange handling part also has: non-integer byte error test section, it monitors the frame length of the aforementioned frame that receives, and detects the non-integer byte error, occupy-place data generating unit, it is in the situation that detect the non-integer byte error by aforementioned non-integer byte error test section, generation and the corresponding occupy-place data of insufficient section, and non-integer byte error counter, it is in the situation that detect the non-integer byte error by aforementioned non-integer byte error test section, count value is progressively increased, aforementioned CRC calculating part, with the aforementioned frame that receives mutually continuously, the occupy-place data that use is generated by aforementioned occupy-place data generating unit, calculate DCS code and FCS code, aforementioned FCS transformation component, be created on the frame that has increased the occupy-place data in the aforementioned frame that receives, aforementioned CRC calculating part is used DCS code and the FCS code that calculates after the occupy-place data, be kept in the DCS field of frame of generation and FCS field and transmit.

switching apparatus of the present invention, it receives the frame that is made of following field: destination address field (DAF) is da field, its storage sends the address of target, source address field is sa field, the address of its storage transmission source, type field, it stores frame length, user data fields, and the Frame Check Sequence field is the FCS field, its storage FCS code, this FCS code is the check code for the error checking of the data that are stored in aforementioned da field, aforementioned sa field, aforementioned type field and aforementioned user data fields, aforementioned user data fields is made of following field: data field, the user data that its storage should send, and the data check sequence field is the DCS field, its storage DCS code, this DCS code is be used to being stored in aforementioned da field, aforementioned sa field, the aforementioned type field, and the check code of the error checking of the data in the aforementioned data field, and, this switching apparatus is with this frame that receives, export the termination function section of the reception ﹠ disposal of outside execution frame to, and transmit the aforementioned frame that receives according to direct-passing mode, it is characterized in that, aforementioned switching apparatus is according to being stored in aforementioned da field, aforementioned sa field, the aforementioned type field, and the data in the aforementioned data field, calculate the DCS code, according to being stored in aforementioned da field, aforementioned sa field, the aforementioned type field, data in aforementioned data field and aforementioned DCS field, calculate the FCS code, aforementioned switching apparatus has: the DCS check portion, its DCS code to calculating, compare with the DCS code in the aforementioned DCS field that is stored in the aforementioned frame that receives, and export the DCS check results that obtains to the exterior terminal function part, the FCS check portion, it compares the FCS code in the FCS code that calculates and the FCS field that is stored in the aforementioned frame that receives, and the FCS check results that obtains of output, the FCS transformation component, it directly transmits the aforementioned frame that receives in the situation that aforementioned FCS check results is consistent, is in inconsistent situation in aforementioned FCS check results, the aforementioned FCS code that calculates is kept in the FCS field of the aforementioned frame that receives, and transmits, and erroneous frame count pick up device, it is in inconsistent situation in aforementioned FCS check results, count value is progressively increased, the aforementioned terminals function part, in the situation that aforementioned DCS check results is consistent, according to carrying out normal process by the frame of aforementioned exchange handling part input, be in inconsistent situation in aforementioned DCS check results, execute exception is processed.

switching apparatus of the present invention, it receives the frame that is made of following field: destination address field (DAF) is da field, its storage sends the address of target, source address field is sa field, the address of its storage transmission source, type field, it stores frame length, data field, the user data that its storage should send, the data check sequence field is the DCS field, its storage DCS code, and this DCS code is the check code for the error checking of the data that are stored in aforementioned da field, aforementioned sa field, aforementioned type field and aforementioned data field, and the Frame Check Sequence field is the FCS field, its storage FCS code, this FCS code is be used to being stored in aforementioned da field, aforementioned sa field, the aforementioned type field, the aforementioned data field, and the check code of the error checking of the data in aforementioned DCS field, and, this switching apparatus is with this frame that receives, export the termination function section of the reception ﹠ disposal of outside execution frame to, and transmit the aforementioned frame that receives according to direct-passing mode, it is characterized in that, aforementioned switching apparatus is according to being stored in aforementioned da field, aforementioned sa field, the aforementioned type field, and the data in the aforementioned data field, calculate the DCS code, according to being stored in aforementioned da field, aforementioned sa field, the aforementioned type field, data in aforementioned data field and aforementioned DCS field, calculate the FCS code, aforementioned switching apparatus has: the CRC calculating part, its beginning from the aforementioned frame that receives begins to carry out CRC and calculates, calculate DCS code and FCS code, the DCS check portion, it compares the DCS code in the DCS code that calculated by aforementioned CRC calculating part and the aforementioned DCS field that is stored in the aforementioned frame that receives, and exports the DCS check results that obtains to the exterior terminal function part, the FCS check portion, it compares the FCS code in the FCS code that calculated by aforementioned CRC calculating part and the FCS field that is stored in the aforementioned frame that receives, and the FCS check results that obtains of output, the FCS transformation component, it directly transmits the aforementioned frame that receives in the situation that aforementioned FCS check results is consistent, is in inconsistent situation in aforementioned FCS check results, the aforementioned FCS code that calculates is kept in the FCS field of the aforementioned frame that receives, and transmits, and erroneous frame count pick up device, it is in inconsistent situation in aforementioned FCS check results, and count value is progressively increased, and this switching apparatus also has: non-integer byte error test section, it monitors the frame length of the aforementioned frame that receives, and detects the non-integer byte error, occupy-place data generating unit, it is in the situation that detect the non-integer byte error by aforementioned non-integer byte error test section, generation and the corresponding occupy-place data of insufficient section, and non-integer byte error counter, it is in the situation that detect the non-integer byte error by aforementioned non-integer byte error test section, count value is progressively increased, aforementioned CRC calculating part, with the aforementioned frame that receives mutually continuously, the occupy-place data that use is generated by aforementioned occupy-place data generating unit, calculate DCS code and FCS code, aforementioned FCS transformation component, be created on the frame that has increased the occupy-place data in the aforementioned frame that receives, aforementioned CRC calculating part is used DCS code and the FCS code that calculates after the occupy-place data, be kept in the DCS field of frame of generation and FCS field and transmit, the aforementioned terminals function part, in the situation that aforementioned DCS check results is consistent, according to carrying out normal process by the frame of aforementioned exchange handling part input, be in inconsistent situation in aforementioned DCS check results, execute exception is processed.

The effect of invention

according to the communicator that the present invention relates to, frame is made of following field: da field, and its storage sends the address of target, sa field, the address of its storage transmission source, type field, it stores frame length, data field, the user data that its storage should send, DCS field, its storage DCS code, this DCS code are for being stored in da field, sa field, type field, and the check code of the error checking of the data of data field, and FCS field, its storage FCS code, this FCS code is be used to being stored in da field, sa field, type field, data field, and the check code of the error checking of the data in the DCS field, and, when the reception of this frame, calculate DCS code and FCS code, DCS code in the DCS code that calculates and the DCS field that is stored in the frame that receives is compared, based on the DCS check results that obtains, judgement is in the da field of the frame that receives, sa field, whether wrong in type field or data field, FCS code in the FCS code that calculates and the FCS field that is stored in the frame that receives is compared, in the situation that the FCS check results that obtains is consistent, directly transmit the frame that receives, be in inconsistent situation in the FCS check results, the FCS code that calculates be kept in the FCS field of the frame that receives and transmit, thus, as long as once producing 1 secondary data in transport process, frame changed, the DCS check results is become inconsistent, the FCS check results only in the situation that the transmission path between this device and the communicator adjacent with this device produce abnormal become inconsistent, so can play following effect, namely, can identify the normality of intraframe data and produce abnormal in transmission path, even in the situation that use through-type exchanged form, also can determine the out-of-the way position of transmission path, and can not make erroneous frame in the network cocycle.

Description of drawings

Fig. 1 means the figure of an example of structure of the communication system of the controller that adopts the execution mode 1 in the present invention.

Fig. 2 means the figure of the structure of Ethernet (registered trade mark) frame.

Fig. 3 means the figure of the structure of the frame that the controller of the execution mode 1 in the present invention uses.

Fig. 4 means the block diagram of the controller architecture of the execution mode 1 in the present invention.

Fig. 5 is the figure of time of delay of transmitting for the frame that explanation is undertaken by the controller of the present invention's execution mode 1.

Fig. 6 means the FCS transformation component corresponding with DCS check results and FCS check results, erroneous frame count pick up device, and the figure of the processing action of termination function section.

Fig. 7 is the flow chart for the controller action of explanation the present invention's execution mode 1.

Fig. 8 is the figure for the communication system action of explanation the present invention's execution mode 1.

Fig. 9 is the figure for the communication system action of explanation the present invention's execution mode 1.

Figure 10 is the figure for the communication system action of explanation the present invention's execution mode 1.

Figure 11 is the figure for the communication system action of explanation the present invention's execution mode 1.

Figure 12 means the figure of an example of the communication system architecture of the controller that adopts the execution mode 1 in the present invention.

Figure 13 means the block diagram of the controller architecture of the execution mode 2 in the present invention.

Figure 14 is the flow chart for the controller action of explanation the present invention's execution mode 2.

Embodiment

Below, describe with reference to the accompanying drawings the communicator that the present invention relates to and the execution mode of switching apparatus in detail.And the present invention is not limited by this execution mode.

Execution mode 1.

With reference to Fig. 1～Figure 12, embodiments of the present invention 1 are described.Fig. 1 means the figure of an example of structure of the communication system of the controller (so-called communicator in claims) that adopts the execution mode 1 in the present invention.In Fig. 1, communication system has a plurality of (in this situation being 4) controller 1-1～1-4, consist of following loop network, namely, controller 1-1 sends frame via transmission path 2-1 to controller 1-2, controller 1-2 sends frame via transmission path 2-2 to controller 1-3, and controller 1-3 sends frame via transmission path 2-3 to controller 1-4, and controller 1-4 sends frame via transmission path 2-4 to controller 1-1.

Fig. 2 means the figure of the structure of common Ethernet (registered trade mark) frame (hereinafter referred to as layer 2 frame).In Fig. 2, layer 2 frame has: the destination address of 6 bytes (below be designated as DA) field 50, and its storage sends the address of target; The source address of 6 bytes (below be designated as SA) field 51, the address of its storage transmission source; The type of 2 bytes (being Type in the drawings) field 52, the type of its storage frame; The DATA field 53 of 46～1500 bytes, it stores user data; And the Frame Check Sequence of 4 bytes (below be designated as FCS) field 54, its storage is used for the code (CRC calculated value) of error checking.

Fig. 3 means the figure of the structure of the frame that the controller 1-1～1-4 of the execution mode 1 in the present invention uses.In Fig. 3, frame has: the destination address of 6 bytes (below be designated as DA) field 60, and its storage sends the address of target; The source address of 6 bytes (below be designated as SA) field 61, the address of its storage transmission source; The type of 2 bytes (being Type in the drawings) field 62, the type of its storage frame; The DATA field 63 of 46～1496 bytes, it stores user data; The data check sequence of 4 bytes (below be designated as DCS) field 64, its storage is used for the code (CRC calculated value) of error checking; And the Frame Check Sequence of 4 bytes (below be designated as FCS) field 65, its storage is used for the code (CRC calculated value) of error checking.

In addition, so-called field here refers to be stored in the memory location of the data in frame, and so-called code refers to for the field shown in frame, with specific bit column (generator polynomial), carry out based on the exclusiveness logic and the value that obtains of division arithmetic.

By Fig. 2 and Fig. 3 as can be known, the frame that the communicator of the execution mode 1 in the present invention uses arranges DCS field 64 in the part (4 byte) of the DATA field 53 of the storage user data of layer 2 frame.Storage is from this part CRC calculated value of da field 60 to DATA fields 63 in DCS field 64, and storage is from this part CRC calculated value of da field 60 to DCS fields 64 (be equivalent to layer 2 frame from DA50 to DATA53) in FCS field 65.

Controller 1-1～1-4 shown in prior figures 1 has identical function.Fig. 4 of the structure of use expression controller 1-1 illustrates the function of controller.In Fig. 4, controller 1-1 has exchange handling part 12 and termination function section 11, and above-mentioned exchange handling part 12 has: CRC calculating part 21, DCS check portion 22, FCS check portion 23, address storage part 24, frame exchange section 25, buffer 26, FCS transformation component 27 and erroneous frame count pick up device 29.

And, for exchange handling part 12, the record part relevant with following transmission processing only, this transmission is treated to, and the frame that will receive from controller 1-4 via transmission path 2-4 is sent to controller 1-2 via transmission path 2-1.

CRC calculating part 21 calculates from the CRC calculated value of the frame of transmission path 2-4 reception.22 pairs of DCS check portion are by comparing from the CRC result of calculation of da field 60 to DATA fields 63 and the CRC calculated value that is stored in DCS field 64 that CRC calculating part 21 calculates, and whether verification is wrong from da field 60 to DATA fields 63.

23 pairs of FCS check portion are by comparing from the CRC result of calculation of da field 60 to DCS fields 64 and the CRC calculated value that is stored in FCS field 65 that CRC calculating part 21 calculates, whether verification is wrong from da field 60 to DCS fields 64, and namely whether whole frame is wrong.

The address of this device that address storage part 24 storages are given in advance.Frame exchange section 25 is in the situation that the address in being stored in sa field 61 is consistent with the address of this device in being stored in address storage part 24, export frame to termination function section 11, address in being stored in sa field 61 be stored in the inconsistent situation in address of this device in address storage part 24, duplicated frame also exports it to termination function section 11 and buffer 26.

Buffer 26 consists of in the mode of FIFO (First-In First-Out), makes frame delay from 25 inputs of frame exchange section after the stipulated time, exports FCS transformation component 27 to.So-called official hour referred to always from the moment that finishes receiving of transmitting the frame of path 2-4, obtained the FCS check results judged by FCS check portion 23, reached the time till the CRC calculated value that is calculated by CRC calculating part 21 to FCS transformation component 27.Therefore, begin to receive frame from transmission path 2-4 from controller 1-1, transmit the needed time to the frame that frame is exported to till transmission path 2-1, become and corresponding time of delay in the transmission time of several bytes (different with store-and-forward mode, expression is direct-passing mode).

Fig. 5 represents to be exported to the state of transmission path 2-1 by controller 1-1 repeating transmission from the frame of transmission path 2-4 input.Buffer 26 exports FCS transformation component 27 to after making and being the time of T size from the frame delay stipulated time of frame exchange section 25 inputs.This time T is always from the moment t0 that the frame that transmits path 2-4 finishes receiving, until complete the time of the moment t1 of following processing, this is treated to, FCS transformation component 27 obtains the check results (FCS check results) of FCS check portion 23 and the CRC result of calculation of CRC calculating part 21, change as required the CRC calculated value in the FCS field 65 that is stored in received frame, thereby can carry out to transmission path 2-1 the transmission of frame.

FCS transformation component 27 is according to the FCS check results of FCS check portion 23, judges whether to change the CRC calculated value that is stored in from the FCS field 65 of the frame of buffer 26 inputs.In the situation that the result CRC calculated value for a change of judgement, the CRC result of calculation from da field 60 to DCS fields 64 that will be calculated by CRC calculating part 21 is stored in FCS field 65, and the frame after the CRC calculated value is changed is sent to transmission path 2-1.In the situation that the result of judgement will directly export transmission path 2-1 to from the frame of buffer 26 inputs for not changing the CRC calculated value.

Erroneous frame count pick up device 29 is counted the reception number of times that is judged as wrong frame according to the FCS check results of FCS check portion 23.

Termination function section 11 is according to the check results (DCS check results) of DCS check portion 22, frame by 25 inputs of frame exchange section is carried out reception ﹠ disposal, generate simultaneously with the frame of this device as transmission source, section is sent to transmission path 2-1 via not shown transmission processing.

Fig. 6 means the figure of the processing of the FCS transformation component 27 corresponding with DCS check results and FCS check results, erroneous frame count pick up device 29 and termination function section 11.In Fig. 6, be " OK (inerrancy) " in the DCS check results, and the FCS check results is in the situation of " OK " (pattern 1), FCS transformation component 27 does not change the CRC calculated value that is stored in FCS field 65.Erroneous frame count pick up device 29 does not increase count value.In addition, termination function section 11 carries out normal process.

Be " NG (wrong) " in the DCS check results, and the FCS check results is in the situation of " OK " (pattern 2), FCS transformation component 27 does not change the CRC calculated value that is stored in FCS field 65.Erroneous frame count pick up device 29 does not increase count value.In addition, termination function section 11 execute exceptions are processed.

Be " OK " at the DCS checking, and the FCS check results is in the situation of " NG " (mode 3), FCS transformation component 27 will be stored in the CRC calculated value in FCS field 65, change to the CRC calculated value that is calculated by CRC calculating part 21.Erroneous frame count pick up device 29 increases count value.In addition, termination function section 11 carries out normal process.

Be " NG " in the DCS check results, and the FCS check results is in the situation of " NG " (pattern 4), FCS transformation component 27 will be stored in the CRC calculated value in FCS field 65, change to the CRC calculated value that is calculated by CRC calculating part 21.Erroneous frame count pick up device 29 increases count value.In addition, termination function section 11 execute exceptions are processed.

That is to say, FCS transformation component 27 is only in vicious situation in the FCS check results, the CRC calculated value that will obtain according to the current data that are stored in from da field 60 to DCS fields 64, be stored in the FCS field 65 of the frame that sends, so that in the N/R situation of transmission path 2-1, next the controller 1-2 of received frame can not detect the frame mistake.In addition, erroneous frame count pick up device 29 is in vicious situation in the FCS check results, makes count value increase (increasing progressively).And termination function section 11 is only in vicious situation in the DCS check results, and execute exception is processed.

Below, with reference to the flow chart of Fig. 7, the action of the controller of explanation present embodiment 1 as an example of controller 1-1 example.If via transmission path 2-4 received frame, CRC calculating part 21 begins the frame that receives is carried out CRC calculating (step S100).

Whether the frame that 25 judgements of frame exchange section receive is the frame (step S101) that this device sends.Specifically, to being stored in the address of this device in address storage part 24, and the address that is stored in the sa field 61 of frame compares.The address of this device in being stored in address storage part 24, in the inconsistent situation in address in the sa field 61 that is stored in frame, namely, in the situation that the frame that receives is not the frame that this device sends, because be the frame that controller 1-2～1-4 sends, so frame exchange section 25 copies the frame of reception and exports it to termination function section 11, simultaneously via buffer 26, exports FCS transformation component 27 (step S102) to.FCS transformation component 27 begins the frame via buffer 26 inputs is transmitted.

On the other hand, if the reception of the DCS field 64 of frame finishes, DCS check portion 22 is obtained the CRC calculated value from da field 60 to DATA fields 63 that is calculated by CRC calculating part 21.The CRC calculated value that 22 verifications of DCS check portion are calculated by CRC calculating part 21 be stored in DCS field 64 in CRC calculated value (judging whether 2 values consistent), export the DCS check results to termination function 11 (the step S103) of section.

If the reception of the FCS field 65 of frame finishes, FCS check portion 23 is obtained the CRC result from da field 60 to DCS fields 64 that is calculated by CRC calculating part 21.The CRC calculated value that 23 verifications of FCS check portion are calculated by CRC calculating part 21 be stored in FCS field 65 in CRC calculated value (judging whether 2 values consistent), export the FCS check results to FCS transformation component 27 and erroneous frame count pick up device 29 (step S104).

In the situation that FCS check results inconsistent (NG), FCS transformation component 27 changes the CRC calculated value (step S106) of FCS field 65.Specifically, obtain the CRC calculated value from da field 60 to DCS fields 64 that is calculated by CRC calculating part 21, the CRC calculated value that obtains is stored in FCS field 65.That is to say, CRC calculated value for the FCS field 65 of the frame that is sent to transmission path 2-1, by will be stored in FCS field 65 from this part CRC calculated value of da field 60 to DCS fields 64, and can not be sent to ensuing controller 1-2 with producing wrong frame.

In addition, be in inconsistent situation in the FCS check results, erroneous frame count pick up device 29 makes count value progressively increase (step S107).

In the situation that the FCS check results is consistent (OK), because normally receive the frame that is sent by controller 1-4, so FCS transformation component 27 does not change the CRC calculated value in FCS field 65 and transmits to transmission path 2-1, erroneous frame count pick up device 29 does not change count value.

On the other hand, the address of this device in being stored in address storage part 24, in the situation consistent with the address in the sa field 61 that is stored in frame, namely, in the situation that the frame that the frame that receives sends for this device, the frame that sends for this device due to the frame that receives, so make frame exchange section 25 be identified as frame to be configured in all controller 1-2 on loop network～1-4 reception, and export frame to termination function 11 (the step S108) of section.

When exchange handling part 12 was carried out above-mentioned action, termination function section 11 was according to the DCS check results by 22 inputs of DCS check portion, to carrying out reception ﹠ disposal by the frame of exchange handling part 12 inputs.Specifically, as described in illustrating as the Fig. 6 before utilizing, in the situation that the DCS check results is " OK ", carry out normal process, in the situation that the DCS check results is " NG ", execute exception is processed.

In normal process, in the situation that the address in being stored in sa field 61 is the address of this device, be judged as the frame of this device transmission by other controller 1-2～1-4 identification, in the situation that the address in being stored in sa field 61 is not the address of this device, be identified as the notice from other controller 1-2～1-4, according to being stored in order in DATA field 63 or data value etc., the processing that puts rules into practice.

In addition, in abnormality processing, carry out to generate and send the predetermined processing that produces the frame of abnormal this situation etc. to other controller 1-2～1-4 notice.

Below, with reference to Fig. 8～Figure 11, illustrate that transmission path produces the action of the communication system in abnormal situation.In addition, making the count value of the erroneous frame count pick up device 29 of controller 1-1～1-4 is initial value (being " 0 " in this situation).

As shown in Figure 8, produce extremely in transmission path 2-1,2-3.Controller 1-1 generates and sends following frame to transmission path 2-1, in aforementioned frame, storage sends the address of the controller 1-2～1-4 of target in da field 60, the address of this device of storage in sa field 61, store frame length in type field 62, store user data in DATA field 63, storage is from the CRC calculated value of da field 60 to DATA field 63 this part data in DCS field 64, and storage is from the CRC calculated value of da field 60 to DCS field 64 this part data in FCS field 65.

The frame that controller 1-1 sends, abnormal because transmission path 2-1 produces, so produce data variation in frame.Therefore, the DCS check results of the DCS check portion 22 of controller 1-2, and the FCS check results of FCS check portion 23 is " NG " (pattern 4 shown in Figure 6).

Therefore, FCS transformation component 27 is stored in received frame from this part CRC calculated value of da field 60 to DCS fields 64 in the FCS field 65 of the frame that sends.In addition, erroneous frame count pick up device 29 progressively increases count value, and making count value is " 1 ".Because the DCS check results is " NG ", so termination function section 11 execute exceptions are processed.

The frame that controller 1-2 transmits arrives controller 1-3 via transmission path 2-2.Because do not produce extremely in transmission path 2-2, so do not produce data variation in the frame that controller 1-2 sends.Therefore, the FCS check results of the FCS check portion 23 of controller 1-3 is " OK ".But, abnormal due to transmission path 2-1, what make frame that controller 1-1 sends produces data variation from da field 60 to DCS fields 64.Therefore, the DCS check results of the DCS check portion 22 of controller 1-3 is " NG ".That is to say, become pattern shown in Figure 62.

Therefore, FCS transformation component 27 does not change the FCS field 65 of the frame of transmission.In addition, as shown in Figure 9, because erroneous frame count pick up device 29 does not make count value progressively increase, so count value is still " 0 ".Because the DCS check results is " NG ", so termination function section 11 execute exceptions are processed.

The frame that controller 1-3 transmits arrives controller 1-4 via transmission path 2-3.Because produce extremely in transmission path 2-3, so produce data variation in the frame that controller 1-3 sends.Therefore, the DCS check results of the DCS check portion 22 of controller 1-4, and the FCS check results of FCS check portion 23 is " NG " (pattern 4 shown in Figure 6).

Therefore, FCS transformation component 27 is stored in received frame from this part CRC calculated value of da field 60 to DCS fields 64 in the FCS field 65 of the frame that sends.In addition, as shown in figure 10, erroneous frame count pick up device 29 progressively increases count value, and making count value is " 1 ".Because the DCS check results is " NG ", so termination function section 11 execute exceptions are processed.

The frame that controller 1-4 transmits arrives controller 1-1 via transmission path 2-4.Because produce extremely in transmission path 2-4, so do not produce data variation in the frame that controller 1-4 sends.Therefore, the FCS check results of the FCS check portion 23 of controller 1-1 is " OK ".But, abnormal due to transmission path 2-1,2-3, the frame that sends at controller 1-1 produce data variation from da field 60 to DCS fields 64.Therefore, the DCS check results of the DCS check portion 22 of controller 1-1 is " NG ".That is to say, become pattern shown in Figure 62.

Therefore, FCS transformation component 27 does not change the FCS field 65 of the frame of transmission.In addition, as shown in figure 11, because erroneous frame count pick up device 29 does not make count value progressively increase, so count value is still " 0 ".Because the DCS check results is " NG ", so termination function section 11 carries out abnormality processing.

Like this, circulation time when between the controller 1-2～1-4 of frame at the looping network that controller 1-1 sends, if produce extremely in transmission path 2-1,2-3, only can make the erroneous frame count pick up device 29 via the controller 1-2, the 1-4 that produce abnormal transmission path 2-1,2-3 received frame increase count values.

Here, corresponding between the pattern of DCS check results shown in Figure 6 and FCS check results and communication system state before illustrating.In " pattern 1 " of Fig. 6, because DCS check results and FCS check results are all " OK ", so to be frame arrive front 1 mistake of this device from the controller of transmission source does not have situation about producing yet, that is, be that the controller from transmission source does not produce abnormal situation to the transmission path of this device.

In " pattern 2 ", because the DCS check results is " NG ", and the FCS check results is " OK ", to be frame produce from the controller of transmission source arrives the process of this device is abnormal, but does not produce abnormal situation at this device with in frame being sent to transmission path between the controller of this device.

In " mode 3 ", because the DCS check results is " OK ", and the FCS check results is " NG ", so be at this device and produce abnormal in frame being sent to transmission path between the controller of this device, but because do not producing data variation from da field 60 to DCS fields 64, thereby can carry out the situation that frame is processed.That is, only make FCS field 65 because transmission path produces the situation of data variation extremely.

In the situation that " mode 3 ", because when frame transmits, utilize FCS transformation component 27, store the CRC calculated value corresponding with the part from da field 60 to DCS fields 64 of received frame in FCS field 65, so its result, make frame that the controller of this frame and transmission source generates similarly, become the frame that stores correct CRC calculated value.

In " pattern 4 ", because DCS check results and FCS check results are all " NG ", so be to produce abnormal situation at this device with in frame being sent to transmission path between the controller of this device, perhaps, be at this device and produce abnormal in frame being sent to transmission path between the controller of this device, and, also produce abnormal situation at the controller from the transmission source of frame between the controller that frame is sent to this device.

Figure 12 means the figure of an example of the communication system architecture of the controller that adopts the execution mode 1 in the present invention.Communication system shown in Figure 12 has increased attending device 3 in communication system shown in Figure 1 in front.For having the component part of identical function with communication system shown in Figure 1, mark identical label, the repetitive description thereof will be omitted.

Attending device 3 utilizes the controller 1-1～1-4 in cable 4 and communication system some (in this situation, being controller 1-2) to connect, and can communicate by letter with controller 1-1～1-4 in communication system via cable 4 and controller 1-2.Attending device 3 obtains the count value of the erroneous frame count pick up device 29 of controller 1-2 via cable 4, obtain the count value of each erroneous frame count pick up device 29 of controller 1-1,1-3,1-4 via cable 4 and controller 1-2.Attending device 3 is presented at the count value of the erroneous frame count pick up device 29 of controller 1-1～1-4 of obtaining in not shown display part.In addition, obtaining the timing of count value of each erroneous frame count pick up device 29 of controller 1-1～1-4, can be every the cycle of predesignating, and can be also obtained by never illustrated input part input of manager when requiring.

Like this, by connect attending device 3 on controller 1-2, need not to make the manager to move to the setting position of each controller 1-1～1-4 in communication system, just can obtain the count value of the erroneous frame count pick up device 29 of each controller 1-1～1-4, can determine the out-of-the way position of transmission path 2-1～2-4.

For example, if communication system is in the state shown in Figure 11 of front, show on attending device 3: the count value of the erroneous frame count pick up device 29 of controller 1-1 is " 0 ", the count value of the erroneous frame count pick up device 29 of controller 1-2 is " 1 ", the count value of the erroneous frame count pick up device 29 of controller 1-3 is " 0 ", and the count value of the erroneous frame count pick up device 29 of controller 1-4 is " 1 ".Thus, the manager can determine, the transmission path 2-1 between controller 1-1 and controller 1-2, and controller 1-3 and controller 1-4 between transmission path 2-3 in exist extremely.

as above explanation, in present embodiment 1, frame is made of following field: da field 60, its storage sends the address of target, sa field 61, the address of its storage transmission source, type field 62, it stores frame length, DATA field 63, the user data that its storage should send, DCS field 64, it stores following CRC calculated value, and this CRC calculated value is for being stored in da field 60, sa field 61, type field 62, and the check code of the error checking of the data of DATA field 63, FCS field 65, it stores following CRC calculated value, this CRC calculated value is be used to being stored in da field 60, sa field 61, type field 62, DATA field 63, and the check code of the error checking of the data in DCS field 64, and, when the reception of this frame, CRC calculating part 21 begins to carry out CRC from the beginning of the frame that receives and calculates, calculating is from the CRC calculated value of da field 60 to DATA fields 63, and from the CRC calculated value of da field 60 to DCS fields 64, by 22 pairs of CRC calculated values from da field 60 to DATA fields 63 of DCS check portion, compare with the CRC calculated value that is stored in DCS field 64, subsequently this DCS check results is exported to termination function section 11, by 23 pairs of CRC calculated values from da field 60 to DCS fields 64 of FCS check portion, compare with the CRC calculated value that is stored in FCS field 65, export this FCS check results to FCS transformation component 27 subsequently, FCS transformation component 27 is in the situation that the FCS check results is consistent, directly transmit the frame that receives, be in inconsistent situation in the FCS check results, the FCS code that calculates be kept in the FCS field 65 of the frame that receives and transmit, 29 pairs of FCS check results of erroneous frame count pick up device are that inconsistent frame is counted, termination function section 11 is in the situation that the DCS check results is consistent, carry out normal reception ﹠ disposal, be in inconsistent situation in the DCS check results, execute exception is processed, therefore, can identify the normality of intraframe data and produce abnormal in transmission path, even in the situation that use through-type exchanged form, also can determine the out-of-the way position of transmission path, and can not make erroneous frame in the network cocycle.

In addition, in present embodiment 1, due to the FCS code of received frame and the computing function of DCS code are concentrated in CRC calculating part 21, therefore make the subject area of calculating the DCS code be da field 60, sa field 61, type field 62, reach aforementioned data field 63, but also can configure respectively CRC calculating part 21 in FCS code calculating part and DCS code calculating part, in this situation, the object that can only calculate as the DCS code with data field 63.

In addition, in above-mentioned DCS code calculating part, also can be without the CRC calculated value, add and other the error in data verification calculated value such as value and use.

Execution mode 2.

With reference to Figure 13 and Figure 14, embodiments of the present invention 2 are described.In execution mode 1, for causing extremely that by transmission path the situation that produces data variation in frame is illustrated.But, because the abnormal mistake that produces of transmission path is not data variation.For example, also there is the situation of the part disappearance of frame, that is, although frame is made of the field take byte as unit usually, sometimes also can receives the frame (producing the frame of non-integer byte error) with non-integer byte data.The communicator of present embodiment 2 is devices of processing the non-integer byte error.

With the communicator of the execution mode 2 in the present invention, be that controller is used for following communication system, in this communication system, replace the controller 1-1～1-4 of the communication system shown in Figure 1 of front, have controller 1a-1～1a-4.

Controller 1a-1～1a-4 has identical function.With reference to the block diagram of the structure of expression controller 1a-1 shown in Figure 13, the function of the controller of present embodiment 2 is described.Controller 1a-1 shown in Figure 13, the FCS transformation component 27 of the controller 1-1 of the execution mode shown in Figure 41 of replacement front, have DCSFCS transformation component 32 (so-called FCS transformation component in claims), and increase non-integer byte error test section 30, occupy-place data generating unit 31, and non-integer byte error counter 33.For having the structure division of identical function with the controller 1-1 of execution mode 1, mark identical label, the repetitive description thereof will be omitted.

Non-integer byte error test section 30 is checked the frame length of the frame that receives, and determines whether to exist the frame of non-integer byte error.Non-integer byte error test section 30 is in the situation that check out the non-integer byte error, exports non-integer byte error notice to occupy-place data generating unit 31, non-integer byte error counter 33, and DCSFCS transformation component 32.In exporting the non-integer byte error notice of occupy-place data generating unit 31 to, comprise the data length of insufficient section.

If occupy-place data generating unit 31 receives non-integer byte error notice, generate with the non-integer byte error and the occupy-place data corresponding to interior data length notify.Occupy-place data generating unit 31 exports the occupy-place data that generate to buffer 26 and CRC calculating part 21.

DCSFCS transformation component 32 is on the basis of the function of the FCS of execution mode 1 transformation component 27, in the situation that receive non-integer byte error notice, the radix-minus-one complement value of following CRC calculated value is stored in DCS field 64, this CRC calculated value be by CRC calculating part 21 that calculate with from CRC calculated value corresponding to da field 60 to DATA fields 63 (the CRC calculated value that the occupy-place data that generate based on the frame that receives and occupy-place data generating unit 31 obtain).

If receive non-integer byte error notice, non-integer byte error counter 33 progressively increases count value, and the number of times that the non-integer byte error produces is counted.

Below, take controller 1a-1 as example, the action of the controller of present embodiment 2 is described.In addition, owing to not producing the non-integer byte error in the action of the controller 1a-1 of present embodiment 2, only make DCSFCS transformation component 32 carry out the action of FCS transformation component 27, identical with the action of the controller 1-1 of the execution mode 1 of the flowchart text of Fig. 7 of reference front, so the description thereof will be omitted here.

With reference to the flow chart of Figure 14, the action of the controller 1a-1 in the situation that produces the non-integer byte error is described.30 monitorings of non-integer byte error test section are via the data length of the frame of transmission path 2-4 reception.If check is to non-integer byte error (if check is to part of non-integer byte from frame) in the frame of reception, non-integer byte error test section 30 exports non-integer byte error notice occupy-place data generating unit 31, non-integer byte error counter 33 to, reaches DCSFCS transformation component 32 (step S200, S201).

If receive non-integer byte error notice, occupy-place data generating unit 31 generates with the non-integer byte error occupy-place data (step S202) corresponding to interior data length notifies.Occupy-place data generating unit 31 exports the occupy-place data that generate to buffer 26 and CRC calculating part 21.

CRC calculating part 21, with the CRC calculated value of the frame that receives mutually continuously, the object data that will also be calculated as CRC by the occupy-place data of occupy-place data generating unit 31 inputs is carried out CRC and is calculated, and with the CRC calculated value notice DCSFCS transformation component 32 that calculates.

On the other hand, DCSFCS transformation component 32 receives the occupy-place data that generated by occupy-place data generating unit 31 via buffer 26, and as the data of the insufficient section of the frame that receives, and generate the frame (step S203) that has increased the occupy-place data.DCSFCS transformation component 32 is sent to transmission path 2-1 with the frame that generates.

At this moment, DCSFCS transformation component 32 is stored the radix-minus-one complement value of following CRC calculated value in DCS field 64, and this CRC calculated value is notified, is equivalent to from the CRC calculated value of this part data of da field 60 to DATA fields 63 by CRC calculating part 21.That is, with the DCS check results of the controller 1-2 of frame that reception the is transmitted CRC calculated value for " NG ", be stored in DCS field 64.

At this moment, DCSFCS transformation component 32 in FCS field 65, storage by CRC calculating part 21 notice, be equivalent to from the CRC calculated value of this part data of da field 60 to DCS fields 64.That is, with the FCS check results of the controller 1-2 of frame that reception the is transmitted CRC calculated value for " OK ", be stored in FCS field 65.

On the other hand, if receive non-integer byte error notice, non-integer byte error counter 33 makes count value progressively increase (step S204).

as above explanation, in present embodiment 2, non-integer byte error test section 30 monitors the frame length of the frame that receives and detects the non-integer byte error, occupy-place data generating unit 31 is in the situation that the non-integer byte error is arrived in check, generate the occupy-place data corresponding with insufficient section, DCSFCS transformation component 32 increases the occupy-place data and generates another frame in the frame that receives, use the frame that generates, calculated from the CRC calculated value of da field 60 to DATA fields 63 by CRC calculating part 21, and the radix-minus-one complement value of this CRC calculated value is stored in DCS field 64, simultaneously, calculating is from the CRC calculated value of da field 60 to DCS fields 64, this CRC calculated value is kept in FCS field 65, and transmit, therefore, even when once producing 1 non-integer byte error, also can be in the normal situation of transmission path, prevent from producing the non-integer byte error in the communicator of back, and can identify the normality of intraframe data and produce abnormal in transmission path, even in the situation that use through-type exchanged form, also can determine the out-of-the way position of transmission path, and can not make erroneous frame in the network cocycle.

In addition, in present embodiment 2, be illustrated as an example of the non-integer byte error example, but can certainly extremely process frames such as off-capacities.

In addition, in the communication system of the attending device shown in Figure 12 3 with front, in the situation that use the controller 1a-1～1a-4 of present embodiment 2, be not the count value of erroneous frame count pick up device 29, attending device 3 can certainly obtain the count value of non-integer byte error counter 33.

In addition, in

execution mode

1 and 2, in controller 1-1～1-4,1a-1～1a-4, termination function section 11 and exchange handling part 12 are set, make termination function section 11 and exchange handling part 12 but also can adopt, so independently install as termination function device and switching apparatus, and consist of communication system.

Industrial applicibility

As mentioned above, the communicator that the present invention relates to and switching apparatus can be effective to require the communication system of real-time and maintainability, especially, are applicable to industrial network system.

Claims

1. communicator, it has:

Termination function section, it carries out the reception ﹠ disposal of frame; And

The exchange handling part, it exports the frame that receives to the aforementioned terminals function part, transmits the aforementioned frame that receives according to direct-passing mode simultaneously,

It is characterized in that,

Aforementioned frame is made of following field:

Destination address field (DAF) is da field, and its storage sends the address of target;

Source address field is sa field, the address of its storage transmission source;

Type field, it stores frame length;

User data fields; And

The Frame Check Sequence field is the FCS field, its storage FCS code, and this FCS code is the check code for the error checking of the data that are stored in aforementioned da field, aforementioned sa field, aforementioned type field and aforementioned user data fields,

Aforementioned user data fields is made of following field: data field, the user data that its storage should send; And the data check sequence field is the DCS field, its storage DCS code, and this DCS code is the check code for the error checking of the data that are stored in aforementioned da field, aforementioned sa field, aforementioned type field and aforementioned data field,

Aforementioned exchange handling part is according to the data that are stored in aforementioned da field, aforementioned sa field, aforementioned type field and aforementioned data field, calculate the DCS code, according to the data that are stored in aforementioned da field, aforementioned sa field, aforementioned type field, aforementioned data field and aforementioned DCS field, calculate the FCS code

Aforementioned exchange handling part has:

The DCS check portion, it compares the DCS code in the DCS code that calculates and the aforementioned DCS field that is stored in the aforementioned frame that receives, and exports the DCS check results that obtains to the aforementioned terminals function part;

The FCS check portion, it compares the FCS code in the FCS code that calculates and the FCS field that is stored in the aforementioned frame that receives, and the FCS check results that obtains of output;

The FCS transformation component, it directly transmits the aforementioned frame that receives in the situation that aforementioned FCS check results is consistent, is in inconsistent situation in aforementioned FCS check results, the aforementioned FCS code that calculates is kept in the FCS field of the aforementioned frame that receives, and transmits; And

Erroneous frame count pick up device, it is in inconsistent situation in aforementioned FCS check results, and count value is progressively increased,

The aforementioned terminals function part in the situation that aforementioned DCS check results is consistent, according to carrying out normal process by the frame of aforementioned exchange handling part input, is in inconsistent situation in aforementioned DCS check results, and execute exception is processed.

2. communicator as claimed in claim 1, is characterized in that,

Using cyclic code is that the CRC code is as aforementioned DCS code and aforementioned FCS code.

3. communicator, it has:

It is characterized in that,

Aforementioned frame is made of following field:

Type field, it stores frame length;

Data field, the user data that its storage should send;

The data check sequence field is the DCS field, its storage DCS code, and this DCS code is the check code for the error checking of the data that are stored in aforementioned da field, aforementioned sa field, aforementioned type field and aforementioned data field; And

The Frame Check Sequence field is the FCS field, its storage FCS code, and this FCS code is the check code for the error checking of the data that are stored in aforementioned da field, aforementioned sa field, aforementioned type field, aforementioned data field and aforementioned DCS field,

Aforementioned exchange handling part has:

CRC calculating part, its beginning from the aforementioned frame that receives begin to carry out CRC and calculate, and calculate DCS code and FCS code;

The DCS check portion, it compares the DCS code in the DCS code that calculated by aforementioned CRC calculating part and the aforementioned DCS field that is stored in the aforementioned frame that receives, and exports the DCS check results that obtains to the aforementioned terminals function part;

The FCS check portion, it compares the FCS code in the FCS code that calculated by aforementioned CRC calculating part and the FCS field that is stored in the aforementioned frame that receives, and the FCS check results that obtains of output;

The aforementioned terminals function part in the situation that aforementioned DCS check results is consistent, according to carrying out normal process by the frame of aforementioned exchange handling part input, is in inconsistent situation in aforementioned DCS check results, and execute exception is processed,

Aforementioned exchange handling part also has:

Non-integer byte error test section, it monitors the frame length of the aforementioned frame that receives, and detects the non-integer byte error;

Occupy-place data generating unit, it is in the situation that detect the non-integer byte error by aforementioned non-integer byte error test section, generation and the corresponding occupy-place data of insufficient section; And

Non-integer byte error counter, it progressively increases count value in the situation that detect the non-integer byte error by aforementioned non-integer byte error test section,

Aforementioned CRC calculating part, with the aforementioned frame that receives mutually continuously, use the occupy-place data that generated by aforementioned occupy-place data generating unit, calculate DCS code and FCS code,

Aforementioned FCS transformation component is created on the frame that has increased the occupy-place data in the aforementioned frame that receives, and aforementioned CRC calculating part is used DCS code and the FCS code that calculates after the occupy-place data, is kept in the DCS field of frame of generation and FCS field and transmits.

4. switching apparatus, it receives the frame that is made of following field:

Type field, it stores frame length;

User data fields; And

And this switching apparatus exports this frame that receives the termination function section of the reception ﹠ disposal of outside execution frame to, and transmits the aforementioned frame that receives according to direct-passing mode,

It is characterized in that,

Aforementioned switching apparatus is according to the data that are stored in aforementioned da field, aforementioned sa field, aforementioned type field and aforementioned data field, calculate the DCS code, according to the data that are stored in aforementioned da field, aforementioned sa field, aforementioned type field, aforementioned data field and aforementioned DCS field, calculate the FCS code

Aforementioned switching apparatus has:

The DCS check portion, it compares the DCS code in the DCS code that calculates and the aforementioned DCS field that is stored in the aforementioned frame that receives, and exports the DCS check results that obtains to the exterior terminal function part;

5. switching apparatus as claimed in claim 4, is characterized in that,

6. switching apparatus, it receives the frame that is made of following field:

Type field, it stores frame length;

Data field, the user data that its storage should send;

It is characterized in that,

Aforementioned switching apparatus has:

The DCS check portion, it compares the DCS code in the DCS code that calculated by aforementioned CRC calculating part and the aforementioned DCS field that is stored in the aforementioned frame that receives, and exports the DCS check results that obtains to the exterior terminal function part;

This switching apparatus also has:

Aforementioned FCS transformation component is created on the frame that has increased the occupy-place data in the aforementioned frame that receives, and aforementioned CRC calculating part is used DCS code and the FCS code that calculates after the occupy-place data, and be kept in the DCS field of frame of generation and FCS field and transmit,